﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Example12_CSharp
{
    class Polygon
    {
        protected int width, height;
        public Polygon(int a)
        {
            width = a;
        }

        public void setValues(int a, int b)
        {
            width = a;
            height = b;
        }
    }
    class Rectangle : Polygon
    {
        public Rectangle(int w, int h)
            : base(w)
        {
            height = h;
        }
        public int area()
        {
            return (width * height);
        }
    }
    class Progarm
    {
        static void Main(string[] args)
        {
            Rectangle rect = new Rectangle(8, 9);
            Console.WriteLine("rect a:{0}", rect.area());
            return;
        }
    }
}
        
